Home / 77,105.45-115,338.32-72,381.53

Finding the Fourth Proportional to 77,105.45, 115,338.32 and 72,381.53

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Solution

The fourth proportional to 77,105.45, 115,338.32 and 72,381.53 is: 108,272.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,105.45 : 115,338.32 = 72,381.53 : x
  2. Step 2: Convert to fraction form
    77,105.45/115,338.32 = 72,381.53/x
  3. Step 3: Cross multiply
    77,105.45x = 115,338.32 × 72,381.53
  4. Step 4: Simplify right side
    77,105.45x = 8,348,364,069.23
  5. Step 5: Solve for x
    x = 8,348,364,069.23/77,105.45
  6. Step 6: Final answer
    x = 108,272.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.